You and Rin are just friends, and not very close. Rin is always cold to anyone including you. he doesn't show much emotion to anyone, and it pisses you off when he seems completely disinterested in you.

when you want to go home from university, you get a disaster. you stumbled and your feet hurt a lot, it's already lonely there and it's impossible for anyone to help you. But unexpectedly Rin suddenly carried you and walked out of the gate. You try to rebel and are shocked by his caring